Browsing by Author "Murthy, S.S."

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A generalized dynamic and steady state analysis of Self Excited Induction Generator (SEIG) based on MATLAB
(IEEE Computer Society help@computer.org, 2005) Murthy, S.S.; Pinto Pius, A.J.P.
This paper presents a Matlab based generalized algorithm to predict the dynamic and steady state performance of Self Excited Induction Generators (SEIG) under any combination of speed, excitation capacitor and loading. The popularity of Self Excited Induction Generator and widespread use in stand-alone applications is centered on analysis, control and design suitable for the application. Three different methods, operational equivalent circuit, Newton-Raphson and equivalent impedance method are used for analyzing under any given situation. The excitation capacitors and load combined with the d-q model of the machine, together with the saturation is used to predict the dynamic behavior of the SEIG. The algorithms are implemented as MATLAB user friendly Tool boxes resulting in considerable simplification over earlier methods.
A generalized dynamic and steady state analysis of Self Excited Induction Generator (SEIG) based on MATLAB
(2005) Murthy, S.S.; Pinto, A.J.P.
This paper presents a Matlab based generalized algorithm to predict the dynamic and steady state performance of Self Excited Induction Generators (SEIG) under any combination of speed, excitation capacitor and loading. The popularity of Self Excited Induction Generator and widespread use in stand-alone applications is centered on analysis, control and design suitable for the application. Three different methods, operational equivalent circuit, Newton-Raphson and equivalent impedance method are used for analyzing under any given situation. The excitation capacitors and load combined with the d-q model of the machine, together with the saturation is used to predict the dynamic behavior of the SEIG. The algorithms are implemented as MATLAB user friendly Tool boxes resulting in considerable simplification over earlier methods.
Novel integral cycle voltage controller for self excited induction generators
(2006) Murthy, S.S.; Pinto, A.J.P.; Beig, A.R.
This paper presents the theory of a new var regulator used for voltage control of self excited induction generators (SEIG). In this approach the excitation capacitors of each phase are switched individually by IGBTs at the zero crossing of respective capacitor currents, thereby eliminating switching losses and harmonics and reducing component count. Simulation results using Matlab-Simulink are presented and compared with experimentally obtained results. The developed integral control scheme presented here overcomes all the shortcomings of existing control schemes and, in addition to being self-starting is also capable of handling capacitive loads, thus making its application in standby generators acceptable with associated reduction in unit costs.
Novel integral cycle voltage controller for self excited induction generators
(2006) Murthy, S.S.; Pinto Pius, A.J.P.; Beig, A.R.
This paper presents the theory of a new var regulator used for voltage control of self excited induction generators (SEIG). In this approach the excitation capacitors of each phase are switched individually by IGBTs at the zero crossing of respective capacitor currents, thereby eliminating switching losses and harmonics and reducing component count. Simulation results using Matlab-Simulink are presented and compared with experimentally obtained results. The developed integral control scheme presented here overcomes all the shortcomings of existing control schemes and, in addition to being self-starting is also capable of handling capacitive loads, thus making its application in standby generators acceptable with associated reduction in unit costs.
Theory, simulation and experimental verification of a new integral cycle robust control strategy for self excited induction generators
(2007) Murthy, S.S.; Pinto, A.J.P.
This paper presents a new control strategy based on integral cycle control of the excitation capacitors to achieve excellent voltage regulation for all types of loads including direct on line starting of induction motors. The integral control strategy not only eliminates switching harmonics but also the requirement of exactly sized capacitors, which are hard to procure. In addition the implemented system is self starting without the need of any external energy source/storage. The paper presents simulation and experimental results both of which show excellent voltage regulation that can be obtained at any desired operating point on the magnetization curve of the core material including the linear region, a region where no operation was possible using the previously available control methods. � 2007 IEEE.
Theory, simulation and experimental verification of a new integral cycle robust control strategy for self excited induction generators
(2007) Murthy, S.S.; Pinto Pius, A.J.P.
This paper presents a new control strategy based on integral cycle control of the excitation capacitors to achieve excellent voltage regulation for all types of loads including direct on line starting of induction motors. The integral control strategy not only eliminates switching harmonics but also the requirement of exactly sized capacitors, which are hard to procure. In addition the implemented system is self starting without the need of any external energy source/storage. The paper presents simulation and experimental results both of which show excellent voltage regulation that can be obtained at any desired operating point on the magnetization curve of the core material including the linear region, a region where no operation was possible using the previously available control methods. Â© 2007 IEEE.